Posted: 12/09/2016 at 08:44
I'd start preparing a new planting site now, digging in some well-rotted manure and soil improver/home made compost - what's your soil like generally? Clay? Loam?
At the same time make sure that the soil around the tree gets watered - not so that it's sodden but you don't want to try to dig it up if it's baked dry and hard.
Then in late November I'd dig it up - digging about 8" each side bigger than the rock circle. Have a tarpaulin ready to lift the tree onto with as much soil as possible and drag it gently to it's new home, that way it should hardly notice that it's been lifted - it will just be much happier and healthier if you've chosen the new site carefully.
I would use a sloping stake, as shown here https://www.rhs.org.uk/advice/profile?PID=208